1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* 32 * Copyright (c) 1988 by Sun Microsystems, Inc. 33 34 */ 35 36 /* 37 * rtime - get time from remote machine 38 * 39 * gets time, obtaining value from host 40 * on the udp/time socket. Since timeserver returns 41 * with time of day in seconds since Jan 1, 1900, must 42 * subtract seconds before Jan 1, 1970 to get 43 * what unix uses. 44 */ 45 #include "namespace.h" 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 #include <errno.h> 50 #include <sys/types.h> 51 #include <sys/socket.h> 52 #include <sys/time.h> 53 #include <netinet/in.h> 54 #include <stdio.h> 55 #include <netdb.h> 56 #include "un-namespace.h" 57 58 extern int _rpc_dtablesize( void ); 59 60 #define NYEARS (unsigned long)(1970 - 1900) 61 #define TOFFSET (unsigned long)(60*60*24*(365*NYEARS + (NYEARS/4))) 62 63 static void do_close( int ); 64 65 int 66 rtime(struct sockaddr_in *addrp, struct timeval *timep, 67 struct timeval *timeout) 68 { 69 int s; 70 fd_set readfds; 71 int res; 72 unsigned long thetime; 73 struct sockaddr_in from; 74 socklen_t fromlen; 75 int type; 76 struct servent *serv; 77 78 if (timeout == NULL) { 79 type = SOCK_STREAM; 80 } else { 81 type = SOCK_DGRAM; 82 } 83 s = _socket(AF_INET, type, 0); 84 if (s < 0) { 85 return(-1); 86 } 87 addrp->sin_family = AF_INET; 88 89 /* TCP and UDP port are the same in this case */ 90 if ((serv = getservbyname("time", "tcp")) == NULL) { 91 return(-1); 92 } 93 94 addrp->sin_port = serv->s_port; 95 96 if (type == SOCK_DGRAM) { 97 res = _sendto(s, (char *)&thetime, sizeof(thetime), 0, 98 (struct sockaddr *)addrp, sizeof(*addrp)); 99 if (res < 0) { 100 do_close(s); 101 return(-1); 102 } 103 do { 104 FD_ZERO(&readfds); 105 FD_SET(s, &readfds); 106 res = _select(_rpc_dtablesize(), &readfds, 107 (fd_set *)NULL, (fd_set *)NULL, timeout); 108 } while (res < 0 && errno == EINTR); 109 if (res <= 0) { 110 if (res == 0) { 111 errno = ETIMEDOUT; 112 } 113 do_close(s); 114 return(-1); 115 } 116 fromlen = sizeof(from); 117 res = _recvfrom(s, (char *)&thetime, sizeof(thetime), 0, 118 (struct sockaddr *)&from, &fromlen); 119 do_close(s); 120 if (res < 0) { 121 return(-1); 122 } 123 } else { 124 if (_connect(s, (struct sockaddr *)addrp, sizeof(*addrp)) < 0) { 125 do_close(s); 126 return(-1); 127 } 128 res = _read(s, (char *)&thetime, sizeof(thetime)); 129 do_close(s); 130 if (res < 0) { 131 return(-1); 132 } 133 } 134 if (res != sizeof(thetime)) { 135 errno = EIO; 136 return(-1); 137 } 138 thetime = ntohl(thetime); 139 timep->tv_sec = thetime - TOFFSET; 140 timep->tv_usec = 0; 141 return(0); 142 } 143 144 static void 145 do_close(int s) 146 { 147 int save; 148 149 save = errno; 150 (void)_close(s); 151 errno = save; 152 } 153